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yeah 06 was the first year for the 5.4 flex fuel (FFV). It was actually an optional engine through 2008.
Now for 09, all the 5.4's are FFV.
Thats what i wondered. It was an option for my 09 6 months ago but not an option anymore so i guess it is standard. Heard it was a very bad idea to use it on a truck/car that wernt a flexfuel model.